Update CI (#8)

Author: cwfitzgerald

.github/workflows/ci.yml

@@ -2,6 +2,12 @@ name: CI
 
 on:
   push:
+    branches-ignore: [
+        # We don't need to run on renovate PRs.
+        "renovate/**",
+        # This is the branch the merge queue creates.
+        "gh-readonly-queue/**",
+      ]
   pull_request:
 
 env: